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'It's really not that complicated. In your project file you had two objects, one for each lens or camera viewport. And you applied one barrel distortion effect to each of them.
With Q3D I cannot address the left and right lens as separate objects. So what I need is a shader that goes across the entire screen, forming two adjacent bulges.'
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It's not as easy as it sounds!
The Paster plugin might be able to do this. (draw 2 quads with barrel distortion and correct image offset applied)
I will post you an example when I have worked it out.
I do have a 'Displacement effect shader' that will work for this, but I can't release it because I made it for a client.
chrisbrobs